Issue

• I use an environment with Windows clients and a Linux webserver. Active Directory provides kerberos authentication services. I am able to use Kerberos Authentication with simple apache website, but when configuring Kerberos Authentication
  on a Virtual host the authentication is unsuccessful and the logs are showing following output :

kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
Acquiring creds for HTTP@krbtest
Verifying client data using KRB5 GSS-API
Client didn't delegate us their credential
Warning: received token seems to be NTLM, which isn't supported by the Kerberos module. Check your IE configuration.
GSS-API major_status:00010000, minor_status:00000000
gss_accept_sec_context() failed: An unsupported mechanism was requested (, Unknown error

• How can I use kerberos authentication for websites, when virtual hosts should be used?